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fed up with those stupid warnings
[mmotm.git] / net / wireless / wext-core.c
bloba4e5ddc8d4f5042b8d0f00c8be65d8b81aa551f8
1 /*
2 * This file implement the Wireless Extensions core API.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
7 *
8 * (As all part of the Linux kernel, this file is GPL)
9 */
10 #include <linux/kernel.h>
11 #include <linux/netdevice.h>
12 #include <linux/rtnetlink.h>
13 #include <linux/wireless.h>
14 #include <linux/uaccess.h>
15 #include <net/cfg80211.h>
16 #include <net/iw_handler.h>
17 #include <net/netlink.h>
18 #include <net/wext.h>
19 #include <net/net_namespace.h>
20
21 typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
22 unsigned int, struct iw_request_info *,
23 iw_handler);
24
25
26 /*
27 * Meta-data about all the standard Wireless Extension request we
28 * know about.
29 */
30 static const struct iw_ioctl_description standard_ioctl[] = {
31 [SIOCSIWCOMMIT - SIOCIWFIRST] = {
32 .header_type = IW_HEADER_TYPE_NULL,
33 },
34 [SIOCGIWNAME - SIOCIWFIRST] = {
35 .header_type = IW_HEADER_TYPE_CHAR,
36 .flags = IW_DESCR_FLAG_DUMP,
37 },
38 [SIOCSIWNWID - SIOCIWFIRST] = {
39 .header_type = IW_HEADER_TYPE_PARAM,
40 .flags = IW_DESCR_FLAG_EVENT,
41 },
42 [SIOCGIWNWID - SIOCIWFIRST] = {
43 .header_type = IW_HEADER_TYPE_PARAM,
44 .flags = IW_DESCR_FLAG_DUMP,
45 },
46 [SIOCSIWFREQ - SIOCIWFIRST] = {
47 .header_type = IW_HEADER_TYPE_FREQ,
48 .flags = IW_DESCR_FLAG_EVENT,
49 },
50 [SIOCGIWFREQ - SIOCIWFIRST] = {
51 .header_type = IW_HEADER_TYPE_FREQ,
52 .flags = IW_DESCR_FLAG_DUMP,
53 },
54 [SIOCSIWMODE - SIOCIWFIRST] = {
55 .header_type = IW_HEADER_TYPE_UINT,
56 .flags = IW_DESCR_FLAG_EVENT,
57 },
58 [SIOCGIWMODE - SIOCIWFIRST] = {
59 .header_type = IW_HEADER_TYPE_UINT,
60 .flags = IW_DESCR_FLAG_DUMP,
61 },
62 [SIOCSIWSENS - SIOCIWFIRST] = {
63 .header_type = IW_HEADER_TYPE_PARAM,
64 },
65 [SIOCGIWSENS - SIOCIWFIRST] = {
66 .header_type = IW_HEADER_TYPE_PARAM,
67 },
68 [SIOCSIWRANGE - SIOCIWFIRST] = {
69 .header_type = IW_HEADER_TYPE_NULL,
70 },
71 [SIOCGIWRANGE - SIOCIWFIRST] = {
72 .header_type = IW_HEADER_TYPE_POINT,
73 .token_size = 1,
74 .max_tokens = sizeof(struct iw_range),
75 .flags = IW_DESCR_FLAG_DUMP,
76 },
77 [SIOCSIWPRIV - SIOCIWFIRST] = {
78 .header_type = IW_HEADER_TYPE_NULL,
79 },
80 [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */
81 .header_type = IW_HEADER_TYPE_POINT,
82 .token_size = sizeof(struct iw_priv_args),
83 .max_tokens = 16,
84 .flags = IW_DESCR_FLAG_NOMAX,
85 },
86 [SIOCSIWSTATS - SIOCIWFIRST] = {
87 .header_type = IW_HEADER_TYPE_NULL,
88 },
89 [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */
90 .header_type = IW_HEADER_TYPE_POINT,
91 .token_size = 1,
92 .max_tokens = sizeof(struct iw_statistics),
93 .flags = IW_DESCR_FLAG_DUMP,
94 },
95 [SIOCSIWSPY - SIOCIWFIRST] = {
96 .header_type = IW_HEADER_TYPE_POINT,
97 .token_size = sizeof(struct sockaddr),
98 .max_tokens = IW_MAX_SPY,
99 },
100 [SIOCGIWSPY - SIOCIWFIRST] = {
101 .header_type = IW_HEADER_TYPE_POINT,
102 .token_size = sizeof(struct sockaddr) +
103 sizeof(struct iw_quality),
104 .max_tokens = IW_MAX_SPY,
105 },
106 [SIOCSIWTHRSPY - SIOCIWFIRST] = {
107 .header_type = IW_HEADER_TYPE_POINT,
108 .token_size = sizeof(struct iw_thrspy),
109 .min_tokens = 1,
110 .max_tokens = 1,
111 },
112 [SIOCGIWTHRSPY - SIOCIWFIRST] = {
113 .header_type = IW_HEADER_TYPE_POINT,
114 .token_size = sizeof(struct iw_thrspy),
115 .min_tokens = 1,
116 .max_tokens = 1,
117 },
118 [SIOCSIWAP - SIOCIWFIRST] = {
119 .header_type = IW_HEADER_TYPE_ADDR,
120 },
121 [SIOCGIWAP - SIOCIWFIRST] = {
122 .header_type = IW_HEADER_TYPE_ADDR,
123 .flags = IW_DESCR_FLAG_DUMP,
124 },
125 [SIOCSIWMLME - SIOCIWFIRST] = {
126 .header_type = IW_HEADER_TYPE_POINT,
127 .token_size = 1,
128 .min_tokens = sizeof(struct iw_mlme),
129 .max_tokens = sizeof(struct iw_mlme),
130 },
131 [SIOCGIWAPLIST - SIOCIWFIRST] = {
132 .header_type = IW_HEADER_TYPE_POINT,
133 .token_size = sizeof(struct sockaddr) +
134 sizeof(struct iw_quality),
135 .max_tokens = IW_MAX_AP,
136 .flags = IW_DESCR_FLAG_NOMAX,
137 },
138 [SIOCSIWSCAN - SIOCIWFIRST] = {
139 .header_type = IW_HEADER_TYPE_POINT,
140 .token_size = 1,
141 .min_tokens = 0,
142 .max_tokens = sizeof(struct iw_scan_req),
143 },
144 [SIOCGIWSCAN - SIOCIWFIRST] = {
145 .header_type = IW_HEADER_TYPE_POINT,
146 .token_size = 1,
147 .max_tokens = IW_SCAN_MAX_DATA,
148 .flags = IW_DESCR_FLAG_NOMAX,
149 },
150 [SIOCSIWESSID - SIOCIWFIRST] = {
151 .header_type = IW_HEADER_TYPE_POINT,
152 .token_size = 1,
153 .max_tokens = IW_ESSID_MAX_SIZE,
154 .flags = IW_DESCR_FLAG_EVENT,
155 },
156 [SIOCGIWESSID - SIOCIWFIRST] = {
157 .header_type = IW_HEADER_TYPE_POINT,
158 .token_size = 1,
159 .max_tokens = IW_ESSID_MAX_SIZE,
160 .flags = IW_DESCR_FLAG_DUMP,
161 },
162 [SIOCSIWNICKN - SIOCIWFIRST] = {
163 .header_type = IW_HEADER_TYPE_POINT,
164 .token_size = 1,
165 .max_tokens = IW_ESSID_MAX_SIZE,
166 },
167 [SIOCGIWNICKN - SIOCIWFIRST] = {
168 .header_type = IW_HEADER_TYPE_POINT,
169 .token_size = 1,
170 .max_tokens = IW_ESSID_MAX_SIZE,
171 },
172 [SIOCSIWRATE - SIOCIWFIRST] = {
173 .header_type = IW_HEADER_TYPE_PARAM,
174 },
175 [SIOCGIWRATE - SIOCIWFIRST] = {
176 .header_type = IW_HEADER_TYPE_PARAM,
177 },
178 [SIOCSIWRTS - SIOCIWFIRST] = {
179 .header_type = IW_HEADER_TYPE_PARAM,
180 },
181 [SIOCGIWRTS - SIOCIWFIRST] = {
182 .header_type = IW_HEADER_TYPE_PARAM,
183 },
184 [SIOCSIWFRAG - SIOCIWFIRST] = {
185 .header_type = IW_HEADER_TYPE_PARAM,
186 },
187 [SIOCGIWFRAG - SIOCIWFIRST] = {
188 .header_type = IW_HEADER_TYPE_PARAM,
189 },
190 [SIOCSIWTXPOW - SIOCIWFIRST] = {
191 .header_type = IW_HEADER_TYPE_PARAM,
192 },
193 [SIOCGIWTXPOW - SIOCIWFIRST] = {
194 .header_type = IW_HEADER_TYPE_PARAM,
195 },
196 [SIOCSIWRETRY - SIOCIWFIRST] = {
197 .header_type = IW_HEADER_TYPE_PARAM,
198 },
199 [SIOCGIWRETRY - SIOCIWFIRST] = {
200 .header_type = IW_HEADER_TYPE_PARAM,
201 },
202 [SIOCSIWENCODE - SIOCIWFIRST] = {
203 .header_type = IW_HEADER_TYPE_POINT,
204 .token_size = 1,
205 .max_tokens = IW_ENCODING_TOKEN_MAX,
206 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
207 },
208 [SIOCGIWENCODE - SIOCIWFIRST] = {
209 .header_type = IW_HEADER_TYPE_POINT,
210 .token_size = 1,
211 .max_tokens = IW_ENCODING_TOKEN_MAX,
212 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
213 },
214 [SIOCSIWPOWER - SIOCIWFIRST] = {
215 .header_type = IW_HEADER_TYPE_PARAM,
216 },
217 [SIOCGIWPOWER - SIOCIWFIRST] = {
218 .header_type = IW_HEADER_TYPE_PARAM,
219 },
220 [SIOCSIWGENIE - SIOCIWFIRST] = {
221 .header_type = IW_HEADER_TYPE_POINT,
222 .token_size = 1,
223 .max_tokens = IW_GENERIC_IE_MAX,
224 },
225 [SIOCGIWGENIE - SIOCIWFIRST] = {
226 .header_type = IW_HEADER_TYPE_POINT,
227 .token_size = 1,
228 .max_tokens = IW_GENERIC_IE_MAX,
229 },
230 [SIOCSIWAUTH - SIOCIWFIRST] = {
231 .header_type = IW_HEADER_TYPE_PARAM,
232 },
233 [SIOCGIWAUTH - SIOCIWFIRST] = {
234 .header_type = IW_HEADER_TYPE_PARAM,
235 },
236 [SIOCSIWENCODEEXT - SIOCIWFIRST] = {
237 .header_type = IW_HEADER_TYPE_POINT,
238 .token_size = 1,
239 .min_tokens = sizeof(struct iw_encode_ext),
240 .max_tokens = sizeof(struct iw_encode_ext) +
241 IW_ENCODING_TOKEN_MAX,
242 },
243 [SIOCGIWENCODEEXT - SIOCIWFIRST] = {
244 .header_type = IW_HEADER_TYPE_POINT,
245 .token_size = 1,
246 .min_tokens = sizeof(struct iw_encode_ext),
247 .max_tokens = sizeof(struct iw_encode_ext) +
248 IW_ENCODING_TOKEN_MAX,
249 },
250 [SIOCSIWPMKSA - SIOCIWFIRST] = {
251 .header_type = IW_HEADER_TYPE_POINT,
252 .token_size = 1,
253 .min_tokens = sizeof(struct iw_pmksa),
254 .max_tokens = sizeof(struct iw_pmksa),
255 },
256 };
257 static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
258
259 /*
260 * Meta-data about all the additional standard Wireless Extension events
261 * we know about.
262 */
263 static const struct iw_ioctl_description standard_event[] = {
264 [IWEVTXDROP - IWEVFIRST] = {
265 .header_type = IW_HEADER_TYPE_ADDR,
266 },
267 [IWEVQUAL - IWEVFIRST] = {
268 .header_type = IW_HEADER_TYPE_QUAL,
269 },
270 [IWEVCUSTOM - IWEVFIRST] = {
271 .header_type = IW_HEADER_TYPE_POINT,
272 .token_size = 1,
273 .max_tokens = IW_CUSTOM_MAX,
274 },
275 [IWEVREGISTERED - IWEVFIRST] = {
276 .header_type = IW_HEADER_TYPE_ADDR,
277 },
278 [IWEVEXPIRED - IWEVFIRST] = {
279 .header_type = IW_HEADER_TYPE_ADDR,
280 },
281 [IWEVGENIE - IWEVFIRST] = {
282 .header_type = IW_HEADER_TYPE_POINT,
283 .token_size = 1,
284 .max_tokens = IW_GENERIC_IE_MAX,
285 },
286 [IWEVMICHAELMICFAILURE - IWEVFIRST] = {
287 .header_type = IW_HEADER_TYPE_POINT,
288 .token_size = 1,
289 .max_tokens = sizeof(struct iw_michaelmicfailure),
290 },
291 [IWEVASSOCREQIE - IWEVFIRST] = {
292 .header_type = IW_HEADER_TYPE_POINT,
293 .token_size = 1,
294 .max_tokens = IW_GENERIC_IE_MAX,
295 },
296 [IWEVASSOCRESPIE - IWEVFIRST] = {
297 .header_type = IW_HEADER_TYPE_POINT,
298 .token_size = 1,
299 .max_tokens = IW_GENERIC_IE_MAX,
300 },
301 [IWEVPMKIDCAND - IWEVFIRST] = {
302 .header_type = IW_HEADER_TYPE_POINT,
303 .token_size = 1,
304 .max_tokens = sizeof(struct iw_pmkid_cand),
305 },
306 };
307 static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
308
309 /* Size (in bytes) of various events */
310 static const int event_type_size[] = {
311 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
312 0,
313 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
314 0,
315 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
316 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
317 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
318 0,
319 IW_EV_POINT_LEN, /* Without variable payload */
320 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
321 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
322 };
323
324 #ifdef CONFIG_COMPAT
325 static const int compat_event_type_size[] = {
326 IW_EV_COMPAT_LCP_LEN, /* IW_HEADER_TYPE_NULL */
327 0,
328 IW_EV_COMPAT_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
329 0,
330 IW_EV_COMPAT_UINT_LEN, /* IW_HEADER_TYPE_UINT */
331 IW_EV_COMPAT_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
332 IW_EV_COMPAT_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
333 0,
334 IW_EV_COMPAT_POINT_LEN, /* Without variable payload */
335 IW_EV_COMPAT_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
336 IW_EV_COMPAT_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
337 };
338 #endif
339
340
341 /* IW event code */
342
343 static int __net_init wext_pernet_init(struct net *net)
344 {
345 skb_queue_head_init(&net->wext_nlevents);
346 return 0;
347 }
348
349 static void __net_exit wext_pernet_exit(struct net *net)
350 {
351 skb_queue_purge(&net->wext_nlevents);
352 }
353
354 static struct pernet_operations wext_pernet_ops = {
355 .init = wext_pernet_init,
356 .exit = wext_pernet_exit,
357 };
358
359 static int __init wireless_nlevent_init(void)
360 {
361 return register_pernet_subsys(&wext_pernet_ops);
362 }
363
364 subsys_initcall(wireless_nlevent_init);
365
366 /* Process events generated by the wireless layer or the driver. */
367 static void wireless_nlevent_process(struct work_struct *work)
368 {
369 struct sk_buff *skb;
370 struct net *net;
371
372 rtnl_lock();
373
374 for_each_net(net) {
375 while ((skb = skb_dequeue(&net->wext_nlevents)))
376 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
377 GFP_KERNEL);
378 }
379
380 rtnl_unlock();
381 }
382
383 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
384
385 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
386 struct sk_buff *skb)
387 {
388 struct ifinfomsg *r;
389 struct nlmsghdr *nlh;
390
391 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
392 if (!nlh)
393 return NULL;
394
395 r = nlmsg_data(nlh);
396 r->ifi_family = AF_UNSPEC;
397 r->__ifi_pad = 0;
398 r->ifi_type = dev->type;
399 r->ifi_index = dev->ifindex;
400 r->ifi_flags = dev_get_flags(dev);
401 r->ifi_change = 0; /* Wireless changes don't affect those flags */
402
403 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
404
405 return nlh;
406 nla_put_failure:
407 nlmsg_cancel(skb, nlh);
408 return NULL;
409 }
410
411
412 /*
413 * Main event dispatcher. Called from other parts and drivers.
414 * Send the event on the appropriate channels.
415 * May be called from interrupt context.
416 */
417 void wireless_send_event(struct net_device * dev,
418 unsigned int cmd,
419 union iwreq_data * wrqu,
420 const char * extra)
421 {
422 const struct iw_ioctl_description * descr = NULL;
423 int extra_len = 0;
424 struct iw_event *event; /* Mallocated whole event */
425 int event_len; /* Its size */
426 int hdr_len; /* Size of the event header */
427 int wrqu_off = 0; /* Offset in wrqu */
428 /* Don't "optimise" the following variable, it will crash */
429 unsigned cmd_index; /* *MUST* be unsigned */
430 struct sk_buff *skb;
431 struct nlmsghdr *nlh;
432 struct nlattr *nla;
433 #ifdef CONFIG_COMPAT
434 struct __compat_iw_event *compat_event;
435 struct compat_iw_point compat_wrqu;
436 struct sk_buff *compskb;
437 #endif
438
439 /*
440 * Nothing in the kernel sends scan events with data, be safe.
441 * This is necessary because we cannot fix up scan event data
442 * for compat, due to being contained in 'extra', but normally
443 * applications are required to retrieve the scan data anyway
444 * and no data is included in the event, this codifies that
445 * practice.
446 */
447 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
448 extra = NULL;
449
450 /* Get the description of the Event */
451 if (cmd <= SIOCIWLAST) {
452 cmd_index = cmd - SIOCIWFIRST;
453 if (cmd_index < standard_ioctl_num)
454 descr = &(standard_ioctl[cmd_index]);
455 } else {
456 cmd_index = cmd - IWEVFIRST;
457 if (cmd_index < standard_event_num)
458 descr = &(standard_event[cmd_index]);
459 }
460 /* Don't accept unknown events */
461 if (descr == NULL) {
462 /* Note : we don't return an error to the driver, because
463 * the driver would not know what to do about it. It can't
464 * return an error to the user, because the event is not
465 * initiated by a user request.
466 * The best the driver could do is to log an error message.
467 * We will do it ourselves instead...
468 */
469 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
470 dev->name, cmd);
471 return;
472 }
473
474 /* Check extra parameters and set extra_len */
475 if (descr->header_type == IW_HEADER_TYPE_POINT) {
476 /* Check if number of token fits within bounds */
477 if (wrqu->data.length > descr->max_tokens) {
478 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
479 return;
480 }
481 if (wrqu->data.length < descr->min_tokens) {
482 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
483 return;
484 }
485 /* Calculate extra_len - extra is NULL for restricted events */
486 if (extra != NULL)
487 extra_len = wrqu->data.length * descr->token_size;
488 /* Always at an offset in wrqu */
489 wrqu_off = IW_EV_POINT_OFF;
490 }
491
492 /* Total length of the event */
493 hdr_len = event_type_size[descr->header_type];
494 event_len = hdr_len + extra_len;
495
496 /*
497 * The problem for 64/32 bit.
498 *
499 * On 64-bit, a regular event is laid out as follows:
500 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
501 * | event.len | event.cmd | p a d d i n g |
502 * | wrqu data ... (with the correct size) |
503 *
504 * This padding exists because we manipulate event->u,
505 * and 'event' is not packed.
506 *
507 * An iw_point event is laid out like this instead:
508 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
509 * | event.len | event.cmd | p a d d i n g |
510 * | iwpnt.len | iwpnt.flg | p a d d i n g |
511 * | extra data ...
512 *
513 * The second padding exists because struct iw_point is extended,
514 * but this depends on the platform...
515 *
516 * On 32-bit, all the padding shouldn't be there.
517 */
518
519 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
520 if (!skb)
521 return;
522
523 /* Send via the RtNetlink event channel */
524 nlh = rtnetlink_ifinfo_prep(dev, skb);
525 if (WARN_ON(!nlh)) {
526 kfree_skb(skb);
527 return;
528 }
529
530 /* Add the wireless events in the netlink packet */
531 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
532 if (!nla) {
533 kfree_skb(skb);
534 return;
535 }
536 event = nla_data(nla);
537
538 /* Fill event - first clear to avoid data leaking */
539 memset(event, 0, hdr_len);
540 event->len = event_len;
541 event->cmd = cmd;
542 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
543 if (extra_len)
544 memcpy(((char *) event) + hdr_len, extra, extra_len);
545
546 nlmsg_end(skb, nlh);
547 #ifdef CONFIG_COMPAT
548 hdr_len = compat_event_type_size[descr->header_type];
549 event_len = hdr_len + extra_len;
550
551 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
552 if (!compskb) {
553 kfree_skb(skb);
554 return;
555 }
556
557 /* Send via the RtNetlink event channel */
558 nlh = rtnetlink_ifinfo_prep(dev, compskb);
559 if (WARN_ON(!nlh)) {
560 kfree_skb(skb);
561 kfree_skb(compskb);
562 return;
563 }
564
565 /* Add the wireless events in the netlink packet */
566 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
567 if (!nla) {
568 kfree_skb(skb);
569 kfree_skb(compskb);
570 return;
571 }
572 compat_event = nla_data(nla);
573
574 compat_event->len = event_len;
575 compat_event->cmd = cmd;
576 if (descr->header_type == IW_HEADER_TYPE_POINT) {
577 compat_wrqu.length = wrqu->data.length;
578 compat_wrqu.flags = wrqu->data.flags;
579 memcpy(&compat_event->pointer,
580 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
581 hdr_len - IW_EV_COMPAT_LCP_LEN);
582 if (extra_len)
583 memcpy(((char *) compat_event) + hdr_len,
584 extra, extra_len);
585 } else {
586 /* extra_len must be zero, so no if (extra) needed */
587 memcpy(&compat_event->pointer, wrqu,
588 hdr_len - IW_EV_COMPAT_LCP_LEN);
589 }
590
591 nlmsg_end(compskb, nlh);
592
593 skb_shinfo(skb)->frag_list = compskb;
594 #endif
595 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
596 schedule_work(&wireless_nlevent_work);
597 }
598 EXPORT_SYMBOL(wireless_send_event);
599
600
601
602 /* IW handlers */
603
604 struct iw_statistics *get_wireless_stats(struct net_device *dev)
605 {
606 #ifdef CONFIG_WIRELESS_EXT
607 if ((dev->wireless_handlers != NULL) &&
608 (dev->wireless_handlers->get_wireless_stats != NULL))
609 return dev->wireless_handlers->get_wireless_stats(dev);
610 #endif
611
612 #ifdef CONFIG_CFG80211_WEXT
613 if (dev->ieee80211_ptr && dev->ieee80211_ptr &&
614 dev->ieee80211_ptr->wiphy &&
615 dev->ieee80211_ptr->wiphy->wext &&
616 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
617 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
618 #endif
619
620 /* not found */
621 return NULL;
622 }
623
624 static int iw_handler_get_iwstats(struct net_device * dev,
625 struct iw_request_info * info,
626 union iwreq_data * wrqu,
627 char * extra)
628 {
629 /* Get stats from the driver */
630 struct iw_statistics *stats;
631
632 stats = get_wireless_stats(dev);
633 if (stats) {
634 /* Copy statistics to extra */
635 memcpy(extra, stats, sizeof(struct iw_statistics));
636 wrqu->data.length = sizeof(struct iw_statistics);
637
638 /* Check if we need to clear the updated flag */
639 if (wrqu->data.flags != 0)
640 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
641 return 0;
642 } else
643 return -EOPNOTSUPP;
644 }
645
646 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
647 {
648 /* Don't "optimise" the following variable, it will crash */
649 unsigned int index; /* *MUST* be unsigned */
650 const struct iw_handler_def *handlers = NULL;
651
652 #ifdef CONFIG_CFG80211_WEXT
653 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
654 handlers = dev->ieee80211_ptr->wiphy->wext;
655 #endif
656 #ifdef CONFIG_WIRELESS_EXT
657 if (dev->wireless_handlers)
658 handlers = dev->wireless_handlers;
659 #endif
660
661 if (!handlers)
662 return NULL;
663
664 /* Try as a standard command */
665 index = cmd - SIOCIWFIRST;
666 if (index < handlers->num_standard)
667 return handlers->standard[index];
668
669 #ifdef CONFIG_WEXT_PRIV
670 /* Try as a private command */
671 index = cmd - SIOCIWFIRSTPRIV;
672 if (index < handlers->num_private)
673 return handlers->private[index];
674 #endif
675
676 /* Not found */
677 return NULL;
678 }
679
680 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
681 const struct iw_ioctl_description *descr,
682 iw_handler handler, struct net_device *dev,
683 struct iw_request_info *info)
684 {
685 int err, extra_size, user_length = 0, essid_compat = 0;
686 char *extra;
687
688 /* Calculate space needed by arguments. Always allocate
689 * for max space.
690 */
691 extra_size = descr->max_tokens * descr->token_size;
692
693 /* Check need for ESSID compatibility for WE < 21 */
694 switch (cmd) {
695 case SIOCSIWESSID:
696 case SIOCGIWESSID:
697 case SIOCSIWNICKN:
698 case SIOCGIWNICKN:
699 if (iwp->length == descr->max_tokens + 1)
700 essid_compat = 1;
701 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
702 char essid[IW_ESSID_MAX_SIZE + 1];
703 unsigned int len;
704 len = iwp->length * descr->token_size;
705
706 if (len > IW_ESSID_MAX_SIZE)
707 return -EFAULT;
708
709 err = copy_from_user(essid, iwp->pointer, len);
710 if (err)
711 return -EFAULT;
712
713 if (essid[iwp->length - 1] == '\0')
714 essid_compat = 1;
715 }
716 break;
717 default:
718 break;
719 }
720
721 iwp->length -= essid_compat;
722
723 /* Check what user space is giving us */
724 if (IW_IS_SET(cmd)) {
725 /* Check NULL pointer */
726 if (!iwp->pointer && iwp->length != 0)
727 return -EFAULT;
728 /* Check if number of token fits within bounds */
729 if (iwp->length > descr->max_tokens)
730 return -E2BIG;
731 if (iwp->length < descr->min_tokens)
732 return -EINVAL;
733 } else {
734 /* Check NULL pointer */
735 if (!iwp->pointer)
736 return -EFAULT;
737 /* Save user space buffer size for checking */
738 user_length = iwp->length;
739
740 /* Don't check if user_length > max to allow forward
741 * compatibility. The test user_length < min is
742 * implied by the test at the end.
743 */
744
745 /* Support for very large requests */
746 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
747 (user_length > descr->max_tokens)) {
748 /* Allow userspace to GET more than max so
749 * we can support any size GET requests.
750 * There is still a limit : -ENOMEM.
751 */
752 extra_size = user_length * descr->token_size;
753
754 /* Note : user_length is originally a __u16,
755 * and token_size is controlled by us,
756 * so extra_size won't get negative and
757 * won't overflow...
758 */
759 }
760 }
761
762 /* kzalloc() ensures NULL-termination for essid_compat. */
763 extra = kzalloc(extra_size, GFP_KERNEL);
764 if (!extra)
765 return -ENOMEM;
766
767 /* If it is a SET, get all the extra data in here */
768 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
769 if (copy_from_user(extra, iwp->pointer,
770 iwp->length *
771 descr->token_size)) {
772 err = -EFAULT;
773 goto out;
774 }
775
776 if (cmd == SIOCSIWENCODEEXT) {
777 struct iw_encode_ext *ee = (void *) extra;
778
779 if (iwp->length < sizeof(*ee) + ee->key_len)
780 return -EFAULT;
781 }
782 }
783
784 err = handler(dev, info, (union iwreq_data *) iwp, extra);
785
786 iwp->length += essid_compat;
787
788 /* If we have something to return to the user */
789 if (!err && IW_IS_GET(cmd)) {
790 /* Check if there is enough buffer up there */
791 if (user_length < iwp->length) {
792 err = -E2BIG;
793 goto out;
794 }
795
796 if (copy_to_user(iwp->pointer, extra,
797 iwp->length *
798 descr->token_size)) {
799 err = -EFAULT;
800 goto out;
801 }
802 }
803
804 /* Generate an event to notify listeners of the change */
805 if ((descr->flags & IW_DESCR_FLAG_EVENT) && err == -EIWCOMMIT) {
806 union iwreq_data *data = (union iwreq_data *) iwp;
807
808 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
809 /* If the event is restricted, don't
810 * export the payload.
811 */
812 wireless_send_event(dev, cmd, data, NULL);
813 else
814 wireless_send_event(dev, cmd, data, extra);
815 }
816
817 out:
818 kfree(extra);
819 return err;
820 }
821
822 /*
823 * Call the commit handler in the driver
824 * (if exist and if conditions are right)
825 *
826 * Note : our current commit strategy is currently pretty dumb,
827 * but we will be able to improve on that...
828 * The goal is to try to agreagate as many changes as possible
829 * before doing the commit. Drivers that will define a commit handler
830 * are usually those that need a reset after changing parameters, so
831 * we want to minimise the number of reset.
832 * A cool idea is to use a timer : at each "set" command, we re-set the
833 * timer, when the timer eventually fires, we call the driver.
834 * Hopefully, more on that later.
835 *
836 * Also, I'm waiting to see how many people will complain about the
837 * netif_running(dev) test. I'm open on that one...
838 * Hopefully, the driver will remember to do a commit in "open()" ;-)
839 */
840 int call_commit_handler(struct net_device *dev)
841 {
842 #ifdef CONFIG_WIRELESS_EXT
843 if ((netif_running(dev)) &&
844 (dev->wireless_handlers->standard[0] != NULL))
845 /* Call the commit handler on the driver */
846 return dev->wireless_handlers->standard[0](dev, NULL,
847 NULL, NULL);
848 else
849 return 0; /* Command completed successfully */
850 #else
851 /* cfg80211 has no commit */
852 return 0;
853 #endif
854 }
855
856 /*
857 * Main IOCTl dispatcher.
858 * Check the type of IOCTL and call the appropriate wrapper...
859 */
860 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
861 unsigned int cmd,
862 struct iw_request_info *info,
863 wext_ioctl_func standard,
864 wext_ioctl_func private)
865 {
866 struct iwreq *iwr = (struct iwreq *) ifr;
867 struct net_device *dev;
868 iw_handler handler;
869
870 /* Permissions are already checked in dev_ioctl() before calling us.
871 * The copy_to/from_user() of ifr is also dealt with in there */
872
873 /* Make sure the device exist */
874 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
875 return -ENODEV;
876
877 /* A bunch of special cases, then the generic case...
878 * Note that 'cmd' is already filtered in dev_ioctl() with
879 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
880 if (cmd == SIOCGIWSTATS)
881 return standard(dev, iwr, cmd, info,
882 &iw_handler_get_iwstats);
883
884 #ifdef CONFIG_WEXT_PRIV
885 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
886 return standard(dev, iwr, cmd, info,
887 iw_handler_get_private);
888 #endif
889
890 /* Basic check */
891 if (!netif_device_present(dev))
892 return -ENODEV;
893
894 /* New driver API : try to find the handler */
895 handler = get_handler(dev, cmd);
896 if (handler) {
897 /* Standard and private are not the same */
898 if (cmd < SIOCIWFIRSTPRIV)
899 return standard(dev, iwr, cmd, info, handler);
900 else if (private)
901 return private(dev, iwr, cmd, info, handler);
902 }
903 /* Old driver API : call driver ioctl handler */
904 if (dev->netdev_ops->ndo_do_ioctl)
905 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
906 return -EOPNOTSUPP;
907 }
908
909 /* If command is `set a parameter', or `get the encoding parameters',
910 * check if the user has the right to do it.
911 */
912 static int wext_permission_check(unsigned int cmd)
913 {
914 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT)
915 && !capable(CAP_NET_ADMIN))
916 return -EPERM;
917
918 return 0;
919 }
920
921 /* entry point from dev ioctl */
922 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
923 unsigned int cmd, struct iw_request_info *info,
924 wext_ioctl_func standard,
925 wext_ioctl_func private)
926 {
927 int ret = wext_permission_check(cmd);
928
929 if (ret)
930 return ret;
931
932 dev_load(net, ifr->ifr_name);
933 rtnl_lock();
934 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
935 rtnl_unlock();
936
937 return ret;
938 }
939
940 /*
941 * Wrapper to call a standard Wireless Extension handler.
942 * We do various checks and also take care of moving data between
943 * user space and kernel space.
944 */
945 static int ioctl_standard_call(struct net_device * dev,
946 struct iwreq *iwr,
947 unsigned int cmd,
948 struct iw_request_info *info,
949 iw_handler handler)
950 {
951 const struct iw_ioctl_description * descr;
952 int ret = -EINVAL;
953
954 /* Get the description of the IOCTL */
955 if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
956 return -EOPNOTSUPP;
957 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
958
959 /* Check if we have a pointer to user space data or not */
960 if (descr->header_type != IW_HEADER_TYPE_POINT) {
961
962 /* No extra arguments. Trivial to handle */
963 ret = handler(dev, info, &(iwr->u), NULL);
964
965 /* Generate an event to notify listeners of the change */
966 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
967 ((ret == 0) || (ret == -EIWCOMMIT)))
968 wireless_send_event(dev, cmd, &(iwr->u), NULL);
969 } else {
970 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
971 handler, dev, info);
972 }
973
974 /* Call commit handler if needed and defined */
975 if (ret == -EIWCOMMIT)
976 ret = call_commit_handler(dev);
977
978 /* Here, we will generate the appropriate event if needed */
979
980 return ret;
981 }
982
983
984 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
985 void __user *arg)
986 {
987 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
988 int ret;
989
990 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
991 ioctl_standard_call,
992 ioctl_private_call);
993 if (ret >= 0 &&
994 IW_IS_GET(cmd) &&
995 copy_to_user(arg, ifr, sizeof(struct iwreq)))
996 return -EFAULT;
997
998 return ret;
999 }
1000
1001 #ifdef CONFIG_COMPAT
1002 static int compat_standard_call(struct net_device *dev,
1003 struct iwreq *iwr,
1004 unsigned int cmd,
1005 struct iw_request_info *info,
1006 iw_handler handler)
1007 {
1008 const struct iw_ioctl_description *descr;
1009 struct compat_iw_point *iwp_compat;
1010 struct iw_point iwp;
1011 int err;
1012
1013 descr = standard_ioctl + (cmd - SIOCIWFIRST);
1014
1015 if (descr->header_type != IW_HEADER_TYPE_POINT)
1016 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1017
1018 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1019 iwp.pointer = compat_ptr(iwp_compat->pointer);
1020 iwp.length = iwp_compat->length;
1021 iwp.flags = iwp_compat->flags;
1022
1023 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1024
1025 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1026 iwp_compat->length = iwp.length;
1027 iwp_compat->flags = iwp.flags;
1028
1029 return err;
1030 }
1031
1032 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1033 unsigned long arg)
1034 {
1035 void __user *argp = (void __user *)arg;
1036 struct iw_request_info info;
1037 struct iwreq iwr;
1038 char *colon;
1039 int ret;
1040
1041 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1042 return -EFAULT;
1043
1044 iwr.ifr_name[IFNAMSIZ-1] = 0;
1045 colon = strchr(iwr.ifr_name, ':');
1046 if (colon)
1047 *colon = 0;
1048
1049 info.cmd = cmd;
1050 info.flags = IW_REQUEST_FLAG_COMPAT;
1051
1052 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1053 compat_standard_call,
1054 compat_private_call);
1055
1056 if (ret >= 0 &&
1057 IW_IS_GET(cmd) &&
1058 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1059 return -EFAULT;
1060
1061 return ret;
1062 }
1063 #endif
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